Journal
ASTRONOMY & ASTROPHYSICS
Volume 536, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201116459
Keywords
cosmology: observations; galaxies: clusters: general; catalogs
Categories
Funding
- National Aeronautics and Space Administration
- Centre National d'Etudes Spatiales (CNES)
- Science and Technology Facilities Council [ST/I005765/1, ST/H00243X/1, ST/F010885/1, ST/I005129/1, ST/G00269X/1, ST/F01239X/1, ST/G002916/1, ST/G001901/1, ST/F002858/1] Funding Source: researchfish
- UK Space Agency [ST/H00002X/1, ST/H001212/1, ST/G003874/1] Funding Source: researchfish
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We present the first all-sky sample of galaxy clusters detected blindly by the Planck satellite through the Sunyaev-Zeldovich (SZ) effect from its six highest frequencies. This early SZ (ESZ) sample is comprised of 189 candidates, which have a high signal-to-noise ratio ranging from 6 to 29. Its high reliability (purity above 95%) is further ensured by an extensive validation process based on Planck internal quality assessments and by external cross-identification and follow-up observations. Planck provides the first measured SZ signal for about 80% of the 169 previously-known ESZ clusters. Planck furthermore releases 30 new cluster candidates, amongst which 20 meet the ESZ signal-to-noise selection criterion. At the submission date, twelve of the 20 ESZ candidates were confirmed as new clusters, with eleven confirmed using XMM-Newton snapshot observations, most of them with disturbed morphologies and low luminosities. The ESZ clusters are mostly at moderate redshifts (86% with z below 0.3) and span more than a decade in mass, up to the rarest and most massive clusters with masses above 1 x 10(15) M-circle dot.
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